Moved some logic from worker.perform_job() to job.cleanup().
Remove unused import.
Merge branch 'selwin-master'
Fix bug where workers would not execute builtin functions properly.
Bump version to 0.3.7.
Merge branch 'hotfix/0.3.7'

Conflicts:
	CHANGES.md
	rq/version.py
Merge branch 'master' into scheduler-integration

Conflicts:
	rq/job.py
	tests/test_job.py
Refactor the get_func_name() helper function a bit.